AFAIK, there is no nested master page template. Following articles will help you achieve the same: MSDN: Walkthrough: Using Nested Master Pages in ASP.NET[^] MSDN: Nested ASP.NET Master Pages[^] MS ASP.NET: Nested Master Pages (C#)[^] Nested Master Page in VS 2008[^]
Sandeep Mewara Microsoft ASP.NET MVP 2012 & 2013 [My Latest Article(s)]: How to extend a WPF Textbox to Custom Picker Server side Delimiters in ASP.NET
